<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<button>按钮</button>

		<script>
			var btnEl = document.querySelector('button')
			function foo() {
				console.log('按钮被点击了')
			}
			btnEl.addEventListener('click', foo)

			setTimeout(function () {
				btnEl.removeEventListener('click', foo)
			}, 5000)
		</script>
	</body>
</html>
